#!/bin/bash -e

OS=$(uname)
ARCH=$(uname -m)

function retrieve_file {
  URL=$1
  FN=$2
  GET=`which wget`
  if test $? -eq 0 ; then
    echo wget -O $FN $URL
    wget -O $FN $URL
  else
    GET=`which curl`
    if test $? -eq 0 ; then
      echo curl -o $FN $URL
      curl -o $FN $URL
      echo "install requires curl or wget to pull tools"
    fi
  fi
}

function install_vicare {
  VICARE_BASE="https://bitbucket.org/marcomaggi/vicare-scheme/downloads"
  VICARE_VERSION="0.4.1-devel.3"
  VICARE_FILE="vicare-scheme-${VICARE_VERSION}.tar.xz"
  VICARE_URL="${VICARE_BASE}/${VICARE_FILE}"

  case $OS in
    Linux) ;;
    *) echo "unexpected operating system $OS" ; exit 1 ;;
  esac 

  retrieve_file ${VICARE_URL} ${VICARE_FILE}

  xzcat ${VICARE_FILE} | tar xf -

  pushd "vicare-scheme-${VICARE_VERSION}"

  ./configure --enable-posix --with-libffi
  make
  sudo make install
  popd  # vicare-scheme-${VICARE_VERSION}
}

function install_ikarus {
  case $ARCH in
    i386|i686) BITS=32 ;;
    x86_64|amd64) BITS=64 ;;
    *) echo "unexpected architecture $ARCH" ; exit 1 ;;
  esac

  case $OS in
    Linux) PREFIX="/usr" ;;
    Darwin) PREFIX="/usr/local" ;;
    *) echo "unexpected operating system $OS" ; exit 1 ;;
  esac

  bzr branch lp:ikarus
  pushd ikarus
  ./configure --prefix=$PREFIX \
    CFLAGS="-m${BITS} `pkg-config --cflags libffi` -I/usr/local/opt/gmp/include" \
    LDFLAGS="-m${BITS} `pkg-config --libs libffi` -L/usr/local/opt/gmp/lib"
  make
  sudo make install
  popd # ikarus
}

function install_chez {
  BASE_URL="https://github.com/cisco/ChezScheme/releases"
  CHEZ_VERSION="9.5.2"
  CHEZ_TGZ="csv${CHEZ_VERSION}.tar.gz"
  CHEZ_EXE="ChezScheme${CHEZ_VERSION}.exe"

  case $ARCH in
    i386|i686) ARCH_MT="i3" ;;
    x86_64|amd64) ARCH_MT="a6" ;;
    *) echo "unexpected architecture $ARCH" ; exit 1 ;;
  esac

  case $OS in
    Linux) OS_MT="le" ;;
    Darwin) OS_MT="osx" ;;
    Windows*|MSYS_NT*) OS_MT="nt" ;;
    *) echo "unexpected operating system $OS" ; exit 1 ;;
  esac

  MT="${ARCH_MT}${OS_MT}"

  case $OS_MT in
    le|osx)
      retrieve_file "${BASE_URL}/download/v${CHEZ_VERSION}/${CHEZ_TGZ}" ${CHEZ_TGZ}
      tar zxf $CHEZ_TGZ
      pushd "csv${CHEZ_VERSION}"
      ./configure -m="${ARCH_MT}${OS_MT}"
      make
      sudo make install
      popd  # "csv${CHEZ_VERSION}"
      ;;
    nt)
      retrieve_file "${BASE_URL}/download/v${CHEZ_VERSION}/${CHEZ_EXE}" ${CHEZ_EXE}
      ./${CHEZ_EXE} /install /quiet
      export PATH=/c/Program\ Files/Chez\ Scheme\ ${CHEZ_VERSION}/bin/${MT}:$PATH
      echo "(scheme-version)" | scheme -q
      ;;
    *) echo "unrecognized OS_MT: ${OS_MT}" ; exit 1 ;;
  esac
}

case $SCHEME in
  vicare) install_vicare ;;
  ikarus) install_ikarus ;;
  chez) install_chez ;;
  *) echo "Please set the SCHEME environment variable to one of: vicare, ikarus, or chez before running" ; exit 1;;
esac
